The first symptoms of ____________________ disease are gray to white discolorations on the fish's ...

The first symptoms of ____________________ disease are gray to white discolorations on the fish's body.
 
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Question 2

Chillers are commonly available in sizes from one-tenth to ten _______________.
 
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Question 3

____________________ water hardness needs to be removed by chemical means of distillation.
 
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Question 4

Knife fish move about by the ___________ motion of their long anal fin.
 
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Question 5

Elephant-snout fish emit an __________ field around their bodies that enables them to move around in the darkness.
 
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